US3949803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of casting molten metal using mold additives
Assignee: Foseco International Ltd
•
Filing: 1974-07-30
•
Granted: 1976-04-13
•
Expires: 1994-07-30
Abstract
Abstract A mould flux which comprises at least 30% by weight of a mixture comprising: I. wollastonite; Ii. at least one low melting fluxing agent.
Inventors
- 👤 Makoto Hiroishi
- 👤 Kazuo Mitsunaga
- 👤 Yoshiyuki Fujisawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:12
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/10; B22D11/11; B22D11/111; C; C22; C22B; C22B9/00; C22B9/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
94 words
A method of casting molten metal in a mould, which method comprises adding to the mould prior to, during or after teeming a mould flux which is in the form of a flowable powder mix consisting essentially of in particulate form: i. wollastonite; ii. at least one low melting fluxing agent; iii. a low density refractory material; the proportion by weight of low density refractory material being at most 15% and the proportion by weight of any alumina (Al 2 O 3 ) in the overall composition being not more than 10% by weight.
Claim 2
Independent Claim
94 words
A method of casting molten metal in a mould, which method comprises adding to the mould prior to, during or after teeming a mould flux which is in the form of a flowable powder mix consisting essentially of in particulate form: i. wollastonite; ii. at least one low melting fluxing agent; iii. a low density refractory material; the proportion by weight of low density refractory material being at most 15% and the proportion by weight of any alumina (Al 2 O 3 ) in the overall composition being not more than 10% by weight.
Claim 3
Dependent Claim
14 words
A method according to claim 1 wherein the casting is continuous casting of steel.
Claim 4
Dependent Claim
17 words
A method according to claim 1 wherein (i) is essentially pure synthetic or natural CaO.SiO 2 .
Claim 5
Dependent Claim
29 words
A method according to claim 1 wherein (i) is CaO.SiO 2 in solid solution with at least one of SiO 2 , CaO and Al 2 O 3 .
Claim 6
Dependent Claim
22 words
A method according to claim 4 wherein the solid solution comprises a phase selected from the group consisting of pseudo-wollastonite and rankinite.
Claim 7
Dependent Claim
37 words
A method according to claim 4 wherein the solid solution has a composition within or at the following molar weight percentage limits: 45 ≦
SiO.sub.2 64
36 ≦
CaO ≦
55
0 < Al.sub.2 O.sub.3
≦
10.
Claim 8
Dependent Claim
28 words
A method according to claim 6 wherein the molar weight percentage limits are: 48 ≦
SiO.sub.2 ≦
45 ≦
CaO ≦
52
0 < Al.sub.2 O.sub.3
≦
7.
Claim 9
Dependent Claim
19 words
A metod according to claim 1 wherein (i) comprises less than 5 mole % Al 2 O 3 .
Claim 10
Dependent Claim
23 words
A method according to claim 1 wherein the flux contains from 40% to 80% by weight of the mixture of (i) and (ii).
Claim 11
Dependent Claim
26 words
A method according to claim 1 wherein (ii) comprises up to 45% by weight of the flux and has a melting point between 700° and 1300°C.
Claim 12
Dependent Claim
36 words
A method according to claim 10 wherein (ii) comprises a compound selected from the group consisting of sodium carbonate, potassium carbonate, sodium fluoride, aluminum fluoride, potassium fluoride, lithium fluoride, cryolite, fluorite, boric acid and a borate.
Claim 13
Dependent Claim
26 words
A method according to claim 1 wherein the low density refractory material comprises a material selected from the group consisting of expanded vermiculite, perlite or pumice.
Claim 14
Dependent Claim
18 words
A method according to claim 1 wherein the flux contains up to 20% by weight of carbonaceous powder.
Claim 15
Dependent Claim
27 words
A method according to claim 13 wherein the carbonaceous powder is a powder selected from the group consisting of charcoal powder, coke powder, anthracite powder and graphite.
Claim 16
Dependent Claim
33 words
A method according to claim 1 wherein the flux contains from 50% to 75% by weight (i), from 4% to 20% by weight perlite and from 1% to 12% by weight sodium carbonate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |